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/**
* @file
*
* @ingroup raspberrypi
*
* @brief Startup code.
*/
/*
* Copyright (c) 2013 by Alan Cudmore
* based on work by:
* Copyright (c) 2009
* embedded brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE
*/
#include <stdbool.h>
#include <bspopts.h>
#include <bsp/start.h>
#include <bsp/raspberrypi.h>
#include <bsp/mmu.h>
#include <bsp/linker-symbols.h>
#include <bsp/uart-output-char.h>
static void BSP_START_TEXT_SECTION clear_bss(void)
{
const int *end = (const int *) bsp_section_bss_end;
int *out = (int *) bsp_section_bss_begin;
/* Clear BSS */
while (out != end) {
*out = 0;
++out;
}
}
static void BSP_START_TEXT_SECTION raspberrypi_cache_setup(void)
{
uint32_t ctrl = 0;
/* Disable MMU and cache, basic settings */
ctrl = arm_cp15_get_control();
ctrl &= ~(ARM_CP15_CTRL_I | ARM_CP15_CTRL_R | ARM_CP15_CTRL_C
| ARM_CP15_CTRL_V | ARM_CP15_CTRL_M);
ctrl |= ARM_CP15_CTRL_S | ARM_CP15_CTRL_A;
arm_cp15_set_control(ctrl);
arm_cp15_cache_invalidate();
arm_cp15_tlb_invalidate();
}
void BSP_START_TEXT_SECTION bsp_start_hook_0(void)
{
raspberrypi_cache_setup();
}
void BSP_START_TEXT_SECTION bsp_start_hook_1(void)
{
/* Copy .text section */
arm_cp15_instruction_cache_invalidate();
bsp_start_memcpy(
(int *) bsp_section_text_begin,
(const int *) bsp_section_text_load_begin,
(size_t) bsp_section_text_size
);
/* Copy .rodata section */
arm_cp15_instruction_cache_invalidate();
bsp_start_memcpy(
(int *) bsp_section_rodata_begin,
(const int *) bsp_section_rodata_load_begin,
(size_t) bsp_section_rodata_size
);
/* Copy .data section */
arm_cp15_instruction_cache_invalidate();
bsp_start_memcpy(
(int *) bsp_section_data_begin,
(const int *) bsp_section_data_load_begin,
(size_t) bsp_section_data_size
);
/* Copy .fast_text section */
arm_cp15_instruction_cache_invalidate();
bsp_start_memcpy(
(int *) bsp_section_fast_text_begin,
(const int *) bsp_section_fast_text_load_begin,
(size_t) bsp_section_fast_text_size
);
/* Copy .fast_data section */
arm_cp15_instruction_cache_invalidate();
bsp_start_memcpy(
(int *) bsp_section_fast_data_begin,
(const int *) bsp_section_fast_data_load_begin,
(size_t) bsp_section_fast_data_size
);
/* Clear .bss section */
clear_bss();
}
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